1. First Department of Medicine, Semmelweis University , Budapest , Hungary
2. Inflammatory Bowel Disease Unit, Hull & East Yorkshire NHS Trust , Hull , UK
3. Department of Pathology, University of Leuven , Leuven , Belgium
4. Department of Colorectal Surgery, St Mark’s Hospital and Academic Institute , London , UK
5. Colorectal Surgery Unit, Catholic University of Paraná , Curitiba, PR , Brazil
6. Division of Gastroenterology, Department of Medicine, McMaster University , Hamilton, ON , Canada
7. Colorectal Surgery Unit, Humanitas Research Hospital, Humanitas University , Milan , Italy
8. Department of Gastroenterology, University Hospital Heraklion , Iraklio , Greece
9. Division of Gastroenterology, Department of Medicine, School of Health Sciences , Ioannina , Greece
10. Inflammatory Bowel Disease Unit, St Mark’s Hospital , London , UK
11. Department of Gastroenterology, Academic Medical Centre, University of Amsterdam , Amsterdam , The Netherlands
12. Division of Gastroenterology and Hepatology, University Hospital Zürich , Zürich , Switzerland
13. Department of Surgery, Academic Medical Center, University of Amsterdam , Amsterdam , The Netherlands